Prep Time 10 minutes mins
Cook Time 30 minutes mins
Resting Time 5 minutes mins
Total Time 45 minutes mins
For a deeper flavor, consider adding a splash of white wine while cooking the onions. If you prefer a creamier texture, stir in a tablespoon of butter before adding the cheese. Adjust seasoning to taste, and remember that the Gruyere cheese will add additional saltiness to the dish.